The \(T\bar{T}\)  deformation [1]}, [2]} has extended our understanding of quantum field theory (QFT) in 1+1 dimensions. The deformed theory has a number of remarkable features which are quite robust and universal. Although a better understanding of certain seemingly pathological properties, such as the Hagedorn behavior of the density of states and the complex energy spectrum is required, it is reasonable to suspect that such deformations are meaningful and lead to an interesting generalization of the usual local QFTs.
